Laughter, tantrums, and swinging are actions readily associated with human children, whereas planning for the future, tooth flossing, and music appreciation are actions typically associated with human adolescents and adults. A number of investigations of nonhuman primates, however, connected these six topics in 2009. Researchers worldwide surveyed the behaviours of nonhuman primates by analyzing the responses of great apes that were tickled, monitoring the public tantrums of young rhesus macaques (Macaca mulatta) and the abilities of long-tailed macaque (M. fascicularis) mothers to facilitate learning, observing the planning activities of a captive chimpanzee (Pan troglodytes), and testing the responses of chimpanzees and cotton-top tamarins (Saguinus oedipus) to different kinds of music. What the researchers learned further defined the connections between humans and nonhuman primates and offered additional insight into what makes humans truly unique. According to Marina Davila Ross...